Period 2 Question 1.

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Presentation transcript:

Period 2 Question 1

As a car skids with its wheels locked trying to stop on a road covered with ice the force of friction between the icy road and the tires usually will be greater than the normal force of the road times the coefficient of static friction equal to the normal force of the road times the coefficient of static friction equal to the normal force of the road times the coefficient of kinetic friction less than the normal force of the road times the coefficient of kinetic friction

Period 2 Question 2

A brick slides on a horizontal surface A brick slides on a horizontal surface. Which of the following will increase the frictional force on it? Putting a second brick on top Decreasing the surface area of contact Increasing the surface area of contact Decreasing the mass of the brick

Period 3 Question 1

In case A a box is dragged along a horizontal surface, in case B it is dragged up an incline by a force parallel to the incline. The frictional force in case B, as compared to case A, is: Always the same Always greater Always less Less for some angles, larger for others

Period 3 Question 2

A ball is thrown downward from the edge of a cliff with an initial speed that is greater than the terminal velocity. Initially the ball’s acceleration is upward acceleration no net acceleration downward, acceleration less than g downward, acceleration greater than g

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